This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
int main (){
ios_base::sync_with_stdio(0); cin.tie(0);
int n;
cin >> n;
vector<int> a(n) , b(n);
for(int i =0; i< n; ++i)cin >> a[i] >> b[i];
for(int k= 0; k< 60; ++k){
for(int i =0; i <n; ++i){
if(a[i] < b[i])continue;
if(a[i] <=1)continue;
a[(i + 1) % n] += (a[i] - b[i] + 1) / 2;
a[i] -= (a[i] - b[i] + 1) / 2 * 2;
}
}
cout << ((a == b) ? "Yes" : "No") << endl;
}
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